content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.internal.operators;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import org.junit.*;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.flowable.*;
  import io.reactivex.flowable.subscribers.*;
  
  public class FlowableDefaultIfEmptyTest {
  
      @Test
      public void testDefaultIfEmpty() {
          Flowable<Integer> source = Flowable.just(1, 2, 3);
          Flowable<Integer> observable = source.defaultIfEmpty(10);
  
          Subscriber<Integer> observer = TestHelper.mockSubscriber();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(10);
          verify(observer).onNext(1);
          verify(observer).onNext(2);
          verify(observer).onNext(3);
          verify(observer).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void testDefaultIfEmptyWithEmpty() {
          Flowable<Integer> source = Flowable.empty();
          Flowable<Integer> observable = source.defaultIfEmpty(10);
  
          Subscriber<Integer> observer = TestHelper.mockSubscriber();
  
          observable.subscribe(observer);
  
          verify(observer).onNext(10);
          verify(observer).onComplete();
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      @Ignore("Subscribers should not throw")
      public void testEmptyButClientThrows() {
          final Subscriber<Integer> o = TestHelper.mockSubscriber();
  
          Flowable.<Integer>empty().defaultIfEmpty(1).subscribe(new DefaultSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  throw new TestException();
              }
  
              @Override
              public void onError(Throwable e) {
                  o.onError(e);
              }
  
              @Override
              public void onComplete() {
                  o.onComplete();
              }
          });
  
          verify(o).onError(any(TestException.class));
          verify(o, never()).onNext(any(Integer.class));
          verify(o, never()).onComplete();
      }
  
      @Test
      public void testBackpressureEmpty() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(0L);
          Flowable.<Integer>empty().defaultIfEmpty(1).subscribe(ts);
          ts.assertNoValues();
          ts.assertNotTerminated();
          ts.request(1);
          ts.assertValue(1);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  
      @Test
      public void testBackpressureNonEmpty() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>(0L);
          Flowable.just(1,2,3).defaultIfEmpty(1).subscribe(ts);
          ts.assertNoValues();
          ts.assertNotTerminated();
          ts.request(2);
          ts.assertValues(1, 2);
          ts.request(1);
          ts.assertValues(1, 2, 3);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  }
  